123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363 |
- // -*- mode: cpp; mode: fold -*-
- // Description /*{{{*/
- // $Id: policy.cc,v 1.10 2003/08/12 00:17:37 mdz Exp $
- /* ######################################################################
- Package Version Policy implementation
-
- This is just a really simple wrapper around pkgVersionMatch with
- some added goodies to manage the list of things..
-
- Priority Table:
-
- 1000 -> inf = Downgradeable priorities
- 1000 = The 'no downgrade' pseduo-status file
- 100 -> 1000 = Standard priorities
- 990 = Config file override package files
- 989 = Start for preference auto-priorities
- 500 = Default package files
- 100 = The status file
- 0 -> 100 = NotAutomatic sources like experimental
- -inf -> 0 = Never selected
-
- ##################################################################### */
- /*}}}*/
- // Include Files /*{{{*/
- #include <apt-pkg/policy.h>
- #include <apt-pkg/configuration.h>
- #include <apt-pkg/tagfile.h>
- #include <apt-pkg/strutl.h>
- #include <apt-pkg/fileutl.h>
- #include <apt-pkg/error.h>
- #include <apt-pkg/sptr.h>
- #include <apti18n.h>
- #include <iostream>
- #include <sstream>
- /*}}}*/
- using namespace std;
- // Policy::Init - Startup and bind to a cache /*{{{*/
- // ---------------------------------------------------------------------
- /* Set the defaults for operation. The default mode with no loaded policy
- file matches the V0 policy engine. */
- pkgPolicy::pkgPolicy(pkgCache *Owner) : Pins(0), PFPriority(0), Cache(Owner)
- {
- PFPriority = new signed short[Owner->Head().PackageFileCount];
- Pins = new Pin[Owner->Head().PackageCount];
- for (unsigned long I = 0; I != Owner->Head().PackageCount; I++)
- Pins[I].Type = pkgVersionMatch::None;
- // The config file has a master override.
- string DefRel = _config->Find("APT::Default-Release");
- if (DefRel.empty() == false)
- CreatePin(pkgVersionMatch::Release,"",DefRel,990);
-
- InitDefaults();
- }
- /*}}}*/
- // Policy::InitDefaults - Compute the default selections /*{{{*/
- // ---------------------------------------------------------------------
- /* */
- bool pkgPolicy::InitDefaults()
- {
- // Initialize the priorities based on the status of the package file
- for (pkgCache::PkgFileIterator I = Cache->FileBegin(); I != Cache->FileEnd(); I++)
- {
- PFPriority[I->ID] = 500;
- if ((I->Flags & pkgCache::Flag::NotSource) == pkgCache::Flag::NotSource)
- PFPriority[I->ID] = 100;
- else
- if ((I->Flags & pkgCache::Flag::NotAutomatic) == pkgCache::Flag::NotAutomatic)
- PFPriority[I->ID] = 1;
- }
- // Apply the defaults..
- SPtrArray<bool> Fixed = new bool[Cache->HeaderP->PackageFileCount];
- memset(Fixed,0,sizeof(*Fixed)*Cache->HeaderP->PackageFileCount);
- signed Cur = 989;
- StatusOverride = false;
- for (vector<Pin>::const_iterator I = Defaults.begin(); I != Defaults.end();
- I++, Cur--)
- {
- pkgVersionMatch Match(I->Data,I->Type);
- for (pkgCache::PkgFileIterator F = Cache->FileBegin(); F != Cache->FileEnd(); F++)
- {
- if (Match.FileMatch(F) == true && Fixed[F->ID] == false)
- {
- if (I->Priority != 0 && I->Priority > 0)
- Cur = I->Priority;
-
- if (I->Priority < 0)
- PFPriority[F->ID] = I->Priority;
- else
- PFPriority[F->ID] = Cur;
-
- if (PFPriority[F->ID] > 1000)
- StatusOverride = true;
-
- Fixed[F->ID] = true;
- }
- }
- }
- if (_config->FindB("Debug::pkgPolicy",false) == true)
- for (pkgCache::PkgFileIterator F = Cache->FileBegin(); F != Cache->FileEnd(); F++)
- cout << "Prio of " << F.FileName() << ' ' << PFPriority[F->ID] << endl;
-
- return true;
- }
- /*}}}*/
- // Policy::GetCandidateVer - Get the candidate install version /*{{{*/
- // ---------------------------------------------------------------------
- /* Evaluate the package pins and the default list to deteremine what the
- best package is. */
- pkgCache::VerIterator pkgPolicy::GetCandidateVer(pkgCache::PkgIterator Pkg)
- {
- // Look for a package pin and evaluate it.
- signed Max = GetPriority(Pkg);
- pkgCache::VerIterator Pref = GetMatch(Pkg);
- // no package = no candidate version
- if (Pkg.end() == true)
- return Pref;
- // packages with a pin lower than 0 have no newer candidate than the current version
- if (Max < 0)
- return Pkg.CurrentVer();
- /* Falling through to the default version.. Setting Max to zero
- effectively excludes everything <= 0 which are the non-automatic
- priorities.. The status file is given a prio of 100 which will exclude
- not-automatic sources, except in a single shot not-installed mode.
- The second pseduo-status file is at prio 1000, above which will permit
- the user to force-downgrade things.
-
- The user pin is subject to the same priority rules as default
- selections. Thus there are two ways to create a pin - a pin that
- tracks the default when the default is taken away, and a permanent
- pin that stays at that setting.
- */
- for (pkgCache::VerIterator Ver = Pkg.VersionList(); Ver.end() == false; Ver++)
- {
- for (pkgCache::VerFileIterator VF = Ver.FileList(); VF.end() == false; VF++)
- {
- /* If this is the status file, and the current version is not the
- version in the status file (ie it is not installed, or somesuch)
- then it is not a candidate for installation, ever. This weeds
- out bogus entries that may be due to config-file states, or
- other. */
- if ((VF.File()->Flags & pkgCache::Flag::NotSource) == pkgCache::Flag::NotSource &&
- Pkg.CurrentVer() != Ver)
- continue;
-
- signed Prio = PFPriority[VF.File()->ID];
- if (Prio > Max)
- {
- Pref = Ver;
- Max = Prio;
- }
- }
-
- if (Pkg.CurrentVer() == Ver && Max < 1000)
- {
- /* Elevate our current selection (or the status file itself)
- to the Pseudo-status priority. */
- if (Pref.end() == true)
- Pref = Ver;
- Max = 1000;
-
- // Fast path optimize.
- if (StatusOverride == false)
- break;
- }
- }
- return Pref;
- }
- /*}}}*/
- // Policy::CreatePin - Create an entry in the pin table.. /*{{{*/
- // ---------------------------------------------------------------------
- /* For performance we have 3 tables, the default table, the main cache
- table (hashed to the cache). A blank package name indicates the pin
- belongs to the default table. Order of insertion matters here, the
- earlier defaults override later ones. */
- void pkgPolicy::CreatePin(pkgVersionMatch::MatchType Type,string Name,
- string Data,signed short Priority)
- {
- Pin *P = 0;
-
- if (Name.empty() == true)
- P = &*Defaults.insert(Defaults.end(),PkgPin());
- else
- {
- // Get a spot to put the pin
- pkgCache::PkgIterator Pkg = Cache->FindPkg(Name);
- if (Pkg.end() == true)
- {
- // Check the unmatched table
- for (vector<PkgPin>::iterator I = Unmatched.begin();
- I != Unmatched.end() && P == 0; I++)
- if (I->Pkg == Name)
- P = &*I;
-
- if (P == 0)
- P = &*Unmatched.insert(Unmatched.end(),PkgPin());
- }
- else
- {
- P = Pins + Pkg->ID;
- }
- }
-
- // Set..
- P->Type = Type;
- P->Priority = Priority;
- P->Data = Data;
- }
- /*}}}*/
- // Policy::GetMatch - Get the matching version for a package pin /*{{{*/
- // ---------------------------------------------------------------------
- /* */
- pkgCache::VerIterator pkgPolicy::GetMatch(pkgCache::PkgIterator Pkg)
- {
- const Pin &PPkg = Pins[Pkg->ID];
- if (PPkg.Type != pkgVersionMatch::None)
- {
- pkgVersionMatch Match(PPkg.Data,PPkg.Type);
- return Match.Find(Pkg);
- }
- return pkgCache::VerIterator(*Pkg.Cache());
- }
- /*}}}*/
- // Policy::GetPriority - Get the priority of the package pin /*{{{*/
- // ---------------------------------------------------------------------
- /* */
- signed short pkgPolicy::GetPriority(pkgCache::PkgIterator const &Pkg)
- {
- if (Pins[Pkg->ID].Type != pkgVersionMatch::None)
- {
- // In this case 0 means default priority
- if (Pins[Pkg->ID].Priority == 0)
- return 989;
- return Pins[Pkg->ID].Priority;
- }
-
- return 0;
- }
- /*}}}*/
- // PreferenceSection class - Overriding the default TrimRecord method /*{{{*/
- // ---------------------------------------------------------------------
- /* The preference file is a user generated file so the parser should
- therefore be a bit more friendly by allowing comments and new lines
- all over the place rather than forcing a special format */
- class PreferenceSection : public pkgTagSection
- {
- void TrimRecord(bool BeforeRecord, const char* &End)
- {
- for (; Stop < End && (Stop[0] == '\n' || Stop[0] == '\r' || Stop[0] == '#'); Stop++)
- if (Stop[0] == '#')
- Stop = (const char*) memchr(Stop,'\n',End-Stop);
- }
- };
- /*}}}*/
- // ReadPinDir - Load the pin files from this dir into a Policy /*{{{*/
- // ---------------------------------------------------------------------
- /* This will load each pin file in the given dir into a Policy. If the
- given dir is empty the dir set in Dir::Etc::PreferencesParts is used.
- Note also that this method will issue a warning if the dir does not
- exists but it will return true in this case! */
- bool ReadPinDir(pkgPolicy &Plcy,string Dir)
- {
- if (Dir.empty() == true)
- Dir = _config->FindDir("Dir::Etc::PreferencesParts");
- if (FileExists(Dir) == false)
- {
- _error->WarningE("FileExists",_("Unable to read %s"),Dir.c_str());
- return true;
- }
- vector<string> const List = GetListOfFilesInDir(Dir, "pref", true, true);
- // Read the files
- for (vector<string>::const_iterator I = List.begin(); I != List.end(); I++)
- if (ReadPinFile(Plcy, *I) == false)
- return false;
- return true;
- }
- /*}}}*/
- // ReadPinFile - Load the pin file into a Policy /*{{{*/
- // ---------------------------------------------------------------------
- /* I'd like to see the preferences file store more than just pin information
- but right now that is the only stuff I have to store. Later there will
- have to be some kind of combined super parser to get the data into all
- the right classes.. */
- bool ReadPinFile(pkgPolicy &Plcy,string File)
- {
- if (File.empty() == true)
- File = _config->FindFile("Dir::Etc::Preferences");
- if (FileExists(File) == false)
- return true;
-
- FileFd Fd(File,FileFd::ReadOnly);
- pkgTagFile TF(&Fd);
- if (_error->PendingError() == true)
- return false;
-
- PreferenceSection Tags;
- while (TF.Step(Tags) == true)
- {
- string Name = Tags.FindS("Package");
- if (Name.empty() == true)
- return _error->Error(_("Invalid record in the preferences file %s, no Package header"), File.c_str());
- if (Name == "*")
- Name = string();
-
- const char *Start;
- const char *End;
- if (Tags.Find("Pin",Start,End) == false)
- continue;
-
- const char *Word = Start;
- for (; Word != End && isspace(*Word) == 0; Word++);
- // Parse the type..
- pkgVersionMatch::MatchType Type;
- if (stringcasecmp(Start,Word,"version") == 0 && Name.empty() == false)
- Type = pkgVersionMatch::Version;
- else if (stringcasecmp(Start,Word,"release") == 0)
- Type = pkgVersionMatch::Release;
- else if (stringcasecmp(Start,Word,"origin") == 0)
- Type = pkgVersionMatch::Origin;
- else
- {
- _error->Warning(_("Did not understand pin type %s"),string(Start,Word).c_str());
- continue;
- }
- for (; Word != End && isspace(*Word) != 0; Word++);
- short int priority = Tags.FindI("Pin-Priority", 0);
- if (priority == 0)
- {
- _error->Warning(_("No priority (or zero) specified for pin"));
- continue;
- }
- istringstream s(Name);
- string pkg;
- while(!s.eof())
- {
- s >> pkg;
- Plcy.CreatePin(Type, pkg, string(Word,End),priority);
- };
- }
- Plcy.InitDefaults();
- return true;
- }
- /*}}}*/
|